亲-亲/疏-疏双子界面在复杂流体中润滑行为的研究  

Studies on the Lubrication between Hydrophilic-Hydrophilic/Hydrophobic-Hydrophobic Gemini Interfaces and Complex Fluids

作　　者：胡志军 孙钟媛 陈华 陈璐 杜淼[2] 宋义虎[2] 郑强[2] Zhi-jun Hu;Zhong-yuan Sun;Hua Chen;Lu Chen;Miao Du;Yi-hu Song;Qiang Zheng(School of Environment and Natural Resources,Zhejiang University of Science and Technology,Hangzhou 310023;MOE Key Laboratory of Macromolecular Synthesis and Functionalization,Department of Polymer Science and Engineering,Zhejiang University,Hangzhou 310058)

机构地区：[1]浙江科技大学环境与资源学院,杭州310023 [2]浙江大学高分子科学与工程学系高分子功能构造与合成教育部重点实验室,杭州310058

出　　处：《高分子学报》2024年第8期1081-1090,共10页Acta Polymerica Sinica

基　　金：国家自然科学基金(基金号52303110);浙江省自然科学基金(基金号LQ23E030001)资助项目.

摘　　要：植入医用软材料摩擦行为对材料植入效果及副作用有决定性影响.分别以临床常用聚二甲基硅氧烷(PDMS)弹性体及类生物组织材料聚丙烯酰胺(PAM)水凝胶为摩擦副,采用丙烯酸衍生聚合物(EMT-10)水分散液为摩擦介质,构建摩擦系统,研究摩擦曲线变化趋势及其影响因素.结果显示,疏水PDMS弹性体对EMT-10聚合物具有较强的吸附作用,其润滑液层由摩擦界面吸附和受限空间束缚的EMT-10聚合物链共同构成.与疏水PDMS弹性体相比,亲水PAM水凝胶与EMT-10聚合物链吸附作用弱,润滑液层由水凝胶表面本体网链和束缚EMT-10聚合物链组成.相对液膜厚度参数可关联界面性质与润滑介质流变行为,判断摩擦系统所处摩擦曲线区域及变化趋势.The frictional behaviors of implant soft materials in vivo are important to medical effect.In this study,hydroxyethyl acrylate sodium/acryloyldimethyl taurate copolymer(EMT-10)aqueous dispersions are adopted,acting as lubricants in hydrophobic polydimethylsiloxane elastomer(PDMS)Gemini interfaces or hydrophilic polyamide hydrogel(PAM)Gemini interfaces,respectively.The associations exist in EMT-10 aqueous dispersions via hydrogen bonding,electrostatic and hydrophobic interactions,similar to bio-lubricants.The EMT-10 aqueous dispersions,surface characteristics of Gemini interfaces and the axial force(Na)during frictional experiments in Stribeck curves are studied.Under low and high concentrations of EMT-10 lubricant,the PDMS Gemini interfaces exhibit opposing sensitivity to Na,different from the PAM Gemini interfaces,which always showing lower CoF at higher Na.This phenomenon results from the various degree of perfection for lubrication film between the Gemini interfaces.To further distinguish the lubrication film formation,and correlate frictional surface characteristic and rheological behaviors of lubricant,a new parameter,relative thickness(φ),is established.When φ<1,the lubrication film is discrete,and the boundary lubrication regime plays dominant role during the frictional test.When φ>1,the entire lubrication film forms and the whole system enters hydrodynamic lubrication regime.For PDMS Gemini interfaces,the lubrication film is composed of the confined and adsorbed EMT-10 polymer chains owing to the strong attraction between the hydrophobic surface and the C-C backbone.As a result,the lubrication film is greatly affected by the concentration of the lubricant thusφincreases.The PDMS frictional system gradually converts from the boundary into hydrodynamic lubrication regime.For PAM Gemini interfaces,the film is made of the hydrogel surface mesh and the confined EMT-10 chains,so φ is always larger than 1,exhibiting the characteristic of hydrodynamic lubrication regime.The study tends to probe the frictiona

关 键 词：润滑 双子界面 硅橡胶 水凝胶 

分 类 号：TH117.2[机械工程—机械设计及理论]